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I have a Nokia 6300, it's already a few years old (no warranty!). I never had any problems with it, it's unlocked and worked fine until now.

Without me changing anything (I didn't drop it, didn't turn it off or even took the battery and SIM out) it suddenly doesn't see any registered SIM card. Instead it is telling me "No SIM card inserted".

I switched it off and on, didn't help. I took the SIM out, tried to clean the contacts, didn't help. I inserted my SIM card into a different phone, it worked fine there. To me it is obvious then that it must be the phone.

What can I do? As I said, I didn't even drop the phone! I do not understand how it suddenly doesn't work anymore